noun, Biology. 1. any organism that uses light as its principal source of energy. /ˈfəʊtəʊˌtrɒf/noun 1. an organism that obtains energy from sunlight for the synthesis of organic compounds phototroph (fō’tə-trŏf’) An organism that manufactures its own food from inorganic substances using light for energy. Green plants, certain algae, and photosynthetic bacteria are phototrophs. Also called photoautotroph.

plural noun, Bacteriology. 1. a group of bacteria, including the green bacteria and purple bacteria, whose energy for growth is derived from sunlight and whose carbon is derived from carbon dioxide or organic carbon.

/ˌfəʊtəʊˈtrəʊpɪ/ noun (chem) 1. an alteration in the colour of certain substances as a result of being exposed to light of different wavelengths 2. the reversible loss of colour of certain dyestuffs when illuminated at a particular wavelength

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